TWO-DIMENSIONAL SUBSPACE TRACKING AND BEAMFORMING FOR ACTIVE ANTENNA SYSTEMS

摘要

According to one aspect of the disclosure, a network node is provided. The network node includes processing circuitry configured to: obtain measurement information, separately track a first direction and a second direction of a signal subspace of a covariance matrix of a channel based at least in part on the obtained measurement information where the first direction being different from the second direction, and optionally perform at least one Multiple Input Multiple Output, MIMO, related operation based on the separate tracking of the first direction and the second direction of the signal subspace of the covariance matrix of the channel.